SBR, MBR, and MBBR calculators and troubleshooting guides
⚙️ Reactor Master Settings
Set master parameters for each reactor type. Values auto-sync to all related calculators.
🔄 SBR Master Parameters
🔬 MBR Master Parameters
🧫 MBBR Master Parameters
🔄 Sequencing Batch Reactor (SBR) Analysis
📖 SBR OPERATIONS & TRAINING GUIDE
⏱️ CYCLE PHASES
• FILL: 25% of cycle - Influent enters, can be static/mixed/aerated
• REACT: 35% of cycle - Aeration for BOD/nutrient removal
• SETTLE: 20% of cycle - Quiescent settling, no mixing
• DECANT: 15% of cycle - Clear effluent withdrawal
• IDLE: 5% of cycle - WAS, prepare for next cycle
⚖️ DESIGN CRITERIA
• Total Cycle: 4-6 hours typical
• HRT: 12-50 hours (varies by treatment goals)
• SRT: 10-30 days (longer for nitrification)
• F/M: 0.05-0.15 lb BOD/lb MLVSS/day
• MLSS: 2,000-5,000 mg/L
• Decant Rate: < 1.0 ft/min to prevent solids carryover
🔬 NUTRIENT REMOVAL
• Nitrification: Aerate to 2+ mg/L DO, SRT > 10 days
• Denitrification: Anoxic fill or react phase, no aeration
• Bio-P Removal: Anaerobic fill (no DO, no nitrate)
• Sequence: Anaerobic → Anoxic → Aerobic for BNR
• Alkalinity: Monitor - nitrification consumes 7.1 mg/L per mg NH3
🔧 TROUBLESHOOTING
• Solids in effluent: Increase settle time, check SVI, reduce decant rate
• Poor nitrification: Increase SRT, check DO, verify alkalinity
• Rising sludge: Denitrification during settle - reduce react time or add post-anoxic
• Foam/scum: Check F/M ratio, may indicate Nocardia/Microthrix
• Hydraulic overload: Reduce fill time, add equalization
Optimize fill, react, settle, decant, and idle phases
💨 SBR Aeration & Oxygen Demand
Calculate oxygen requirements for BOD and nitrogen removal
⬇️ SBR Settling Performance
Analyze settling characteristics and decant performance
📊 SBR Loading Parameters
Calculate F/M ratio, volumetric loading, and MLSS inventory
🚿 SBR Waste Sludge (WAS)
Calculate waste activated sludge requirements
🌿 SBR Nutrient Removal (BNR)
Evaluate nitrogen and phosphorus removal performance
🔧 SBR Troubleshooting Guide
Diagnose common SBR operational issues and get recommended solutions
🔬 Membrane Bioreactor (MBR) Analysis
📖 MBR OPERATIONS & TRAINING GUIDE
💧 KEY PARAMETERS
• Flux: 8-15 GFD (gallons/ft²/day) typical
• TMP: 1-8 psi operating, >12 psi = fouling
• Permeability: Monitor trend, not absolute value
• MLSS: 8,000-15,000 mg/L (higher than conventional)
• SRT: 15-25 days (long for membrane protection)
• HRT: 4-8 hours (compact footprint)
🔄 MEMBRANE CLEANING
• Relaxation: Every 8-12 min, 30-60 sec pause
• Backwash: Reverse flow to dislodge solids
• Maintenance Clean: Weekly NaOCl (200-500 ppm)
• Recovery Clean: Monthly/quarterly intensive
• Citric Acid: For inorganic fouling (scaling)
• NaOH: For organic/biological fouling
⚡ ENERGY CONSIDERATIONS
• Scour Air: 50-70% of MBR energy use
• Scour Rate: 0.02-0.05 SCFM/ft² membrane
• Total Energy: 1.5-2.5 kWh/1000 gal (vs 0.8-1.2 conventional)
• Optimization: Intermittent vs continuous scouring
• Fine screens: Critical - 1-3mm to protect membranes
🔧 TROUBLESHOOTING
• Rising TMP: Fouling - increase cleaning frequency
• Flux decline: Check for fiber damage, clean membranes
• Foaming: High F/M, reduce WAS, check for surfactants
• High turbidity: Fiber breakage - perform integrity test
• Energy spike: Check blower filters, diffuser fouling
Calculate process aeration and membrane scour air requirements
⚡ MBR Energy Analysis
Calculate energy consumption and costs
🧹 MBR Cleaning & Recovery
Track membrane fouling and cleaning effectiveness
📊 MBR Loading & SRT
Calculate loading rates and solids retention time
🔧 MBR Troubleshooting Guide
Diagnose common MBR operational issues
🧫 Moving Bed Biofilm Reactor (MBBR) Analysis
📖 MBBR OPERATIONS & TRAINING GUIDE
🎯 MEDIA SPECIFICATIONS
• Fill Ratio: 40-67% of reactor volume
• Protected Surface Area: 500-800 m²/m³
• Specific Gravity: 0.94-0.98 (slightly buoyant)
• Retention Screens: 6-10mm slots (keep media in)
• Media Types: K1, K3, K5, BioPortz, AnoxKaldnes
• Biofilm Thickness: 50-300 μm optimal
⚖️ DESIGN LOADING RATES
• BOD Removal (SALR): 5-25 g BOD/m²/day
• Nitrification (SANR): 0.5-1.5 g NH₃-N/m²/day
• Pre-DN (Denitrification): 1-3 g NO₃-N/m²/day
• Post-DN: 0.5-1.5 g NO₃-N/m²/day (carbon limited)
• Higher loads: Need more aeration, watch DO
• Temperature: Correct loading for T < 15°C
💨 AERATION & MIXING
• Process Air: 1.5-2.0 lb O₂/lb BOD removed
• Mixing Air: 0.5-1.5 SCFM/cf of media
• DO Target: 3-5 mg/L for nitrification
• Grid Diffusers: Medium bubble preferred
• Media Movement: Must keep carriers in suspension
• Dead Zones: Avoid with proper diffuser layout
🔧 TROUBLESHOOTING
• Media clumping: Increase mixing air, check for filaments
• Screen blinding: Excessive biofilm - increase sloughing
• Poor nitrification: Check DO, temperature, BOD load
• Media loss: Check screen integrity, weir levels
• Thick biofilm: May need mechanical shearing
Create your own scenarios to model capital projects specific to your facility
💰 Operations Cost Calculator
Daily Cost
$0.00
Operating
Monthly Cost
$0.00
30-day avg
Annual Cost
$0.00
Projected
Cost per MG
$0.00
$/MG treated
🏭 Plant Information
🧪 Chemical Costs
Chemical
Dose (mg/L)
Unit Cost ($/lb)
Daily Use (lb)
Daily Cost
Monthly Cost
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Chemical Subtotal
$0.00
$0.00
⚡ Energy Costs
Equipment
HP/kW
Qty
Hours/Day
Daily kWh
Daily Cost
Monthly Cost
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Energy Subtotal
0
$0.00
$0.00
🚛 Solids Disposal Costs
Wet Tons per Day
-
wet tons/day
Loads per Month
-
loads
Disposal Cost
-
$/month
Hauling Cost
-
$/month
Solids Subtotal
$0.00
/month
📊 Total Cost Summary
Chemical Costs
$0.00
/month
$0.00
/year
Energy Costs
$0.00
/month
$0.00
/year
Solids Disposal
$0.00
/month
$0.00
/year
TOTAL
$0.00
/month
$0.00
/year
Cost per MG Treated
$0.00/MG
👥 Client & Project Management
Total Clients
0
Active Projects
0
Plants Managed
0
Revenue YTD
$0
➕ Add New Client
📋 Client Database
No clients added yet. Add your first client above!
📁 Projects
No projects yet. Create a project after adding clients.
📝 Proposal Generator
📋 Create New Proposal
🔧 Services & Scope
Select services to include in your proposal. Prices are customizable.
💰 Proposal Summary
Selected Services Subtotal:$0.00
Total Proposal:$0.00
📂 Saved Proposals
No saved proposals yet.
💵 ROI Calculator
📊 Current vs Proposed Scenario
📍 Current State
Current Annual Cost: $0
🎯 After Improvements
Proposed Annual Cost: $0
💰 Investment & Payback Analysis
📈 ROI Results
Enter current and proposed values, then click "Calculate ROI" to see results.
📊 Savings Breakdown
📄 Client Report
⏱️ Time Tracking
⏱️ Active Timer
00:00:00
➕ Manual Time Entry
📊 Time Log
Total Hours
0
Billable Hours
0
Unbilled Amount
$0
Avg Hours/Day
0
No time entries yet. Start the timer or add manual entries above.
📈 Weekly Summary
Mon
0
Tue
0
Wed
0
Thu
0
Fri
0
Sat
0
Sun
0
🤖 AI Enhancement
🧠 Intelligent Process Analysis
AI Powered
Let AI analyze your plant data and provide optimization recommendations
🔮 AI Insights & Recommendations
Click an analysis type above to generate AI-powered insights based on your current plant data.
💡 Process Optimization
92% Confidence
Based on current F/M ratio and MLSS levels, consider increasing RAS rate by 8-12% to improve settling and reduce SVI.
⚡ Energy Saving Opportunity
87% Confidence
DO levels are consistently above setpoint. Reducing blower output by 15% during 2AM-6AM could save approximately $2,400/month.
⚠️ Predictive Alert
78% Confidence
SVI trend indicates potential filamentous bulking in 7-10 days. Consider implementing chlorination or nutrient adjustment.
🛠️ Quick AI Tools
📝
AI Report Writer
Generate professional reports from your data
🔍
Smart Troubleshooter
Diagnose issues with intelligent questioning
📈
Process Optimizer
Get real-time optimization suggestions
✅
Compliance Advisor
TCEQ regulation guidance and DMR review
💬 AI Assistant Chat
Hello! I'm your WWTP AI assistant. I can help you with process optimization, troubleshooting, compliance questions, and more. What would you like to discuss?
Analyzing...
📊 Google Sheets Sync
🔗 Connect to Google Sheets
Export plant data to Google Sheets for tracking, reporting, and analysis.
Not Connected
📤 Export Data to Sheet
📊 Daily Operations
🧪 Lab Results
💰 Costs
🔄 Auto-Sync Settings
📋 Service Proposal Generator
📋 Create Professional Proposal
Generate customized service proposals for wastewater consulting engagements.
👤 Client Information
🏭 Facility Information
🛠️ Services Offered
📋 Routine Services
📊 Reports & Compliance
🔧 Special Projects
💰 Pricing
📅 DAILY OPERATIONS
📍 Jump to Section (15 Features)
📋
Checklist
📝
Shift Log
📓🎤
VOICE JOURNAL
Tap to Log • Hands-Free
🚨
Alarms
⚡
Energy
🔧
Work Orders
🧪
Lab Samples
📅
Calendar
🎓
Certs
🧴
Chemicals
🌤️
Weather
📈
Flow Total
📊
% Removal
📓
VOICE JOURNAL
🎤 Hands-Free Logging • Auto-Timestamped
NEW
Hands-free logging with voice input. All entries automatically timestamped for documentation.
TAP TO SPEAK
Chrome, Edge, or Safari required
0
Today
0
This Week
0
Total
0
Voice
📓
No journal entries yet
Start logging with text or voice input above
📋 Daily Rounds Checklist
Complete all items during your shift. Progress is saved automatically.
🌅 Morning Checks (6:00 AM)
☀️ Midday Checks (12:00 PM)
🌙 Evening Checks (6:00 PM)
Progress:0 / 15 (0%)
🧙 Calculation Wizards
Guided step-by-step calculations for common tasks. Perfect for new operators!
⚖️ F/M Ratio Wizard
Calculate Food to Microorganism ratio step by step
5 steps • ~2 min
⏱️ SRT Wizard
Calculate Solids Retention Time with guidance
6 steps • ~3 min
🚿 WAS Rate Wizard
Determine optimal waste activated sludge rate
4 steps • ~2 min
🧪 Chlorine Dose Wizard
Calculate chlorine dosing requirements
4 steps • ~2 min
🧪 SVI Wizard
Calculate Sludge Volume Index step by step
3 steps • ~1 min
📉 BOD Removal Wizard
Calculate BOD removal efficiency
4 steps • ~2 min
🔄 RAS Rate Wizard
Calculate Return Activated Sludge rate
3 steps • ~2 min
⏰ Detention Time Wizard
Calculate hydraulic detention time
3 steps • ~1 min
🎓 Operator Training
Interactive training modules for new operators. Complete all modules to earn certification!
Module 1: Activated Sludge Basics
Understanding biological treatment fundamentals
What is Activated Sludge?
Activated sludge is a biological process that uses microorganisms to break down organic matter in wastewater. The "activated" refers to the active mass of microorganisms that consume pollutants.
Key Components:
Aeration Basin: Where microorganisms mix with wastewater and oxygen
Secondary Clarifier: Separates treated water from biomass
Return Activated Sludge (RAS): Recycles microorganisms back to aeration
Waste Activated Sludge (WAS): Removes excess biomass from system
Module 2: Key Process Parameters
MLSS, SVI, F/M, SRT, and what they mean
Essential Parameters Every Operator Must Know:
MLSS (Mixed Liquor Suspended Solids)
Concentration of microorganisms in aeration basin. Typical: 2,000-4,000 mg/L
SVI (Sludge Volume Index)
Settleability indicator. Good: 80-150 mL/g. High SVI = poor settling (bulking)
F/M (Food to Microorganism Ratio)
BOD loading per unit biomass. Typical: 0.2-0.5 lb BOD/lb MLVSS/day
SRT (Solids Retention Time)
Average time solids stay in system. Typical: 5-15 days for conventional activated sludge
Module 3: Troubleshooting Common Problems
Identify and fix operational issues
⚠️ Common Problems & Solutions:
Sludge Bulking (High SVI > 150)
Causes: Low DO, low F/M, nutrient deficiency
Fix: Increase DO, add nutrients, consider chlorination of RAS
BOD Load (lb/day) = BOD (mg/L) × Flow (MGD) × 8.34
ℹ️
Percent Removal
% Removal = ((In - Out) / In) × 100
ℹ️
Detention Time
DT (hours) = (Volume gal × 24) / (Flow GPD)
ℹ️
Surface Overflow Rate
SOR = Flow (GPD) / Surface Area (sq ft)
ℹ️
CT (Disinfection)
CT = Chlorine Residual (mg/L) × Contact Time (min)
ℹ️
📋 Operator Shift Logbook
NEW v9.9.17
Digital shift handoff documentation. Log events and issues for seamless transitions.
Current Shift
Day Shift
DAY
➕ Quick Log
07:15Routine
Shift started. All equipment operational.
🚨 Alarm Management
NEW v9.9.17
⚠️ Critical
0
⚡ Warnings
0
✓ Ack'd
0
!
High DO - Basin 1
DO 4.8 mg/L exceeds 3.0 setpoint
⚡ Energy Dashboard
NEW v9.9.17
Today
5,240
kWh
Intensity
1,048
kWh/MG
Monthly
$12.4K
Est.
Peak
485
kW
📊 Energy by Process
💨Aeration55%
🔄Pumping25%
🏢Other20%
📝 Work Orders
NEW v9.9.17
📋 Open
3
🔄 Progress
2
✅ Done
15
Open
WO-0156: Blower #2 Bearing
John D. | Due: Dec 26
In Progress
WO-0155: Clarifier Inspection
Mike S. | Due: Dec 28
➕ Quick Work Order
🧪 Lab Sample Tracker
NEW v9.9.19
📦 Pending
5
🔬 At Lab
3
✓ Complete
47
⚠️ Overdue
0
SAM-2024-1247● At Lab
Dec 22, 08:15
Influent Composite - BOD, TSS, NH₃
📍 Point: INF-01🧊 Temp: 4°C⏱️ Hold: 24hr left
SAM-2024-1246✓ Results Ready
Dec 21, 14:30
Effluent Grab - pH, DO, Chlorine Res.
📍 Point: EFF-01📊 All Pass
➕ Log New Sample
📅 Compliance Calendar
NEW v9.9.19
December 2024
Sun
Mon
Tue
Wed
Thu
Fri
Sat
📋 Upcoming Deadlines
DMR Submission
Dec 28, 2024
5 days
Monthly BOD/TSS Sampling
Dec 30, 2024
7 days
Quarterly Biosolids Report
Jan 15, 2025
23 days
🎓 Operator Certifications
NEW v9.9.19
✓ Valid
4
⚠️ Expiring
1
📚 CEUs
24
A
John Smith
Class A WWTP Operator • License #WW-12345
Valid
Expires: Mar 15, 2025CEUs: 18/20 required
B
Mike Johnson
Class B WWTP Operator • License #WW-23456
Expiring Soon
Expires: Jan 30, 2025CEUs: 12/15 required
🧪 Chemical Inventory
NEW v9.9.19
⚠️
Low Stock Alert
Sodium Hypochlorite below reorder point (15%)
🧪
Polymer (Cationic)78%
455 lbs remainingEst. 23 days
💧
Ferric Chloride42%
320 gal remainingEst. 12 days
🧴
Sodium Hypochlorite15%
120 gal remainingEst. 4 days ⚠️
📦 Log Delivery / Usage
🌤️ Weather & Operations Impact
NEW v9.9.19
☀️
72°F
Sunny, Clear Skies
📍 Houston, TX
💧 45%
💨 8 mph
🌧️ 0%
Mon
☀️
74°
Tue
⛅
71°
Wed
🌧️
65°
Thu
🌧️
62°
Fri
⛅
68°
🌧️
Rain Expected Wed-Thu
Expected: 1.5-2.0 inches. Prepare for I/I increase. Consider reducing WAS rates preemptively.
Est. Flow Impact
+15%
Temp Effect on Bio
Optimal
Storm Prep Status
Ready
⚙️ PROCESS CONTROL
📍 Jump to Section
🎯
Optimizer
🧮
Adv Calcs
🎛️
Master Settings
📥
Loading
🧫
Sludge
💨
Oxygen
📊
Calcs
🧪
Chemicals
🌊
Hydraulics
📈
SPC Charts
🔬
Lab Calcs
📈
Flow Total
📊
% Removal
💨
Aeration
🎯 Process Optimization AdvisorGENIUS v9.9.19
OPTIMIZATION SCORE
70
/ 100
GOOD
ANNUAL SAVINGS
💰
$48K
potential/year
RECOMMENDATIONS
2
HIGH
3
MED
1
LOW
6 total actions
QUICK WINS
⚡
3
implement today
📊 ANALYSIS AREAS
💨
Aeration
Analyzing...
$12K/yr
85%
🧫
Solids Mgmt
Analyzing...
$8K/yr
72%
🌿
Nutrient Removal
Analyzing...
$6K/yr
88%
🧪
Chemical Dosing
Analyzing...
$15K/yr
58%
⚡
Energy Efficiency
Analyzing...
$7K/yr
75%
🎯 PRIORITIZED RECOMMENDATIONS
📋 Implementation Progress
0 of 6 completed
Realized Savings: $0Remaining: $48K
🧮 Advanced Calculator Suite12 NEW TOOLS
💨
Blower
⚗️
Alkalinity
🌀
SVI
🧪
Chlorine
🔄
Pump
🔀
Flow Split
🧫
Polymer
🫧
Aeration
↩️
Return Rate
⚖️
Loading
🚛
Sludge
⚡
Energy
💨 Blower Air Requirement
SCFM
Air Required
2,083
SCFM
HP Estimate
75
Horsepower
⚗️ Alkalinity for Nitrification
lbs/day
Alk Consumed
1,840
lbs/day as CaCO₃
Soda Ash Needed
485
lbs/day
🌀 SVI & Settleability Analysis
mL/g
SVI
83
mL/g
SDI
1.20
g/100mL
Status
GOOD
Settling
✓ Normal settling characteristics. Maintain current operations.
🧪 Chlorine Dosing Calculator
lbs/day
📖 CHLORINE DISINFECTION GUIDE
What It Does: Calculates chlorine feed rate to achieve target dose for pathogen inactivation. The formula is: lbs/day = Flow (MGD) × Dose (mg/L) × 8.34
⚖️ Regulatory Standards:
• NPDES Permit: Typical effluent limits 0.5-1.0 mg/L TRC (Total Residual Chlorine)
• EPA Disinfection: Must achieve required log removal of pathogens
• CT Requirement: Contact Time × Residual must meet permit (see CT Calculator)
• Dechlorination: Required if TRC limit < 0.1 mg/L (aquatic toxicity)
✓ Best Practices:
• Typical Doses: Secondary effluent 2-8 mg/L, Primary 5-20 mg/L
• Contact Time: Minimum 15-30 minutes at peak flow
• Residual Target: 0.5-2.0 mg/L at end of contact chamber
• Chlorine Forms: Gas (100%), Sodium Hypochlorite (12.5%), Calcium Hypochlorite (65%)
• Safety: Gas chlorine requires HAZMAT plan, scrubber systems
🔧 Troubleshooting:
• High chlorine demand: Check for ammonia (breakpoint chlorination), organics, sulfides
• Low residual: Increase dose, check contact time, inspect diffusers
• Permit violations: Verify analyzer calibration, check dechlorination system
• Coliform failures: Increase CT, check for short-circuiting in contact tank
Purpose: Distribute flow evenly across parallel treatment units to optimize performance and prevent overloading. Uneven flow causes poor treatment in overloaded units and wasted capacity in underloaded units.
✓ Best Practices:
• Equal Split: Ideal for identical units - use weirs or splitter boxes
• Unequal Split: May be needed for units with different capacities
• Flow Measurement: Install flow meters on each train for verification
• Weir Leveling: Check splitter box weirs quarterly for buildup/damage
📊 Common Applications:
• Primary Clarifiers: Even distribution prevents short-circuiting
• Aeration Basins: Balance organic loading across trains
• Secondary Clarifiers: Critical for proper solids settling
• Filters: Even loading extends filter run times
🔧 Troubleshooting:
• Uneven flow: Check weir levels, gate positions, blockages
• Surging: Install baffles or flow equalization
• Unit offline: Recalculate splits, adjust gates/weirs
• Poor performance: Verify actual vs. design flow per unit
📋 Note: Total of all splits must equal 100% • Verify with flow meters
Unit 1
2.0
MGD (40%)
Unit 2
1.75
MGD (35%)
Unit 3
1.25
MGD (25%)
🧫 Polymer Dosing Calculator
lbs/DT
📖 POLYMER CONDITIONING GUIDE
Purpose: Polymers (flocculants) condition sludge for dewatering by binding solids particles together, improving cake capture and dryness on belt presses, centrifuges, or filter presses.
📊 Solution Preparation:
• Emulsion Polymers: Dilute to 0.25-1.0% for activation
• Dry Polymers: Mix to 0.1-0.5% solution, age 30-60 min
• Neat Polymers: Use inline dilution systems
• Water Quality: Soft water preferred, avoid chlorinated water
🔧 Troubleshooting:
• Poor floc: Adjust dose, check polymer age, verify mixing energy
• Wet cake: Increase dose, check belt tension/speed, verify solids feed
• Over-dosing: Slimy cake, polymer in filtrate, wasted chemical cost
• Jar Testing: Always jar test new sludge conditions or polymer lots
📋 Note: DT = Dry Ton (2000 lbs dry solids) • Always conduct jar tests to optimize dose
📊 Typical Depths:
• Fine Bubble Diffusers: 15-20 ft (deeper = more efficient transfer)
• Coarse Bubble: 10-15 ft
• Mechanical Aerators: 10-15 ft
• Oxidation Ditches: 8-14 ft
🔧 Operational Tips:
• Multiple basins: Allows maintenance, flow flexibility
• Baffles: Prevent short-circuiting, improve plug flow
• Freeboard: Allow 2-3 ft above water level
• DO Control: Target 1.5-2.5 mg/L (higher for nitrification)
📊 WAS Control Strategies:
• Constant WAS: Fixed daily volume, adjust based on SRT
• Constant SRT: WAS = Inventory ÷ Target SRT
• MLSS Control: Waste to maintain target MLSS
• SVI-based: Increase WAS if SVI rising
🔧 Troubleshooting:
• Rising blanket: Increase RAS, check for denitrification, increase WAS
• Low MLSS: Decrease WAS, check for washout, verify RAS pumps
• Solids in effluent: Check SVI, reduce hydraulic loading, adjust RAS
• Young sludge: Reduce WAS, increase SRT for better settling
📋 References: WEF MOP 8 • Activated Sludge Process Control Manual
RAS Ratio
60%
RAS Flow
2.1
MGD
Recycle
1,458
GPM
⚖️ Organic Loading Rates
lbs/day
📖 ORGANIC LOADING RATE (OLR) GUIDE
Formulas:
• Mass Load (lbs/day) = Flow (MGD) × Conc (mg/L) × 8.34
• OLR = BOD Load (lbs/day) ÷ Aeration Volume (1000 cf)
• F/M Ratio = BOD Load (lbs/day) ÷ MLVSS (lbs)
📊 Typical Yield Coefficients:
• Primary Sludge: 50-70% of influent TSS removed
• WAS Yield (Y): 0.4-0.8 lb VSS/lb BOD removed
• Decay Rate (kd): 0.04-0.08 day⁻¹
• Combined: Net yield typically 0.5-0.7 lb TSS/lb BOD
📦 Sludge Characteristics:
• Primary: 3-8% solids, high VS (65-80%), good dewaterability
• WAS: 0.5-1.5% solids, high VS (75-85%), harder to dewater
• Digested: 2-5% solids, lower VS (45-55%), easier to dewater
• Belt Press Cake: 15-22% solids
• Centrifuge Cake: 18-28% solids
🔧 Disposal Options:
• Landfill: Most common, requires cake >20% for handling
• Land Application: Class B biosolids, agronomic rates
• Composting: Requires bulking agent, 15:1 to 30:1 C:N
• Incineration: High energy cost, strict air permits
📋 References: 40 CFR Part 503 • WEF MOP 8 Chapter on Solids Processing
Dry Solids
3,503
lbs/day
Wet Cake
19,461
lbs/day
Weekly Loads
3.4
@ 20 tons
⚡ Energy Cost Calculator
$/day
📖 ENERGY MANAGEMENT GUIDE
Formulas:
• kW = HP × 0.746 ÷ Motor Efficiency
• kWh/day = kW × Run Hours
• Cost = kWh × Rate ($/kWh)
⚡ Energy Distribution (Typical WWTP):
• Aeration: 45-75% of total energy (largest consumer!)
• Pumping: 10-25% (influent, RAS, effluent)
• Solids Handling: 5-15% (thickening, dewatering, digestion)
• UV Disinfection: 5-10% (if applicable)
• Buildings/HVAC: 5-10%
💰 Cost Reduction Strategies:
• DO Control: Reduce aeration to maintain 1.5-2.0 mg/L (not higher)
• VFDs: Variable frequency drives save 20-50% on pumps/blowers
• Off-Peak Operation: Run dewatering during low-rate hours
• Premium Motors: 92-96% efficient vs. 85-90% standard
• Fine Bubble Diffusers: Most efficient aeration method
📊 Benchmarks:
• Efficient plants: 1,000-1,500 kWh/MG treated
• Average plants: 1,500-2,500 kWh/MG
• Energy-intensive: >2,500 kWh/MG (review processes)
• Energy cost: Typically 25-40% of O&M budget
📋 References: EPA Energy Management Guide • EPRI Water & Wastewater Benchmarking
Daily kWh
1,656
Daily Cost
$149
Annual Cost
$54K
🔬 Advanced Calculator Suite II10 NEW TOOLS
🧬
Nutrient
🔥
Digester Gas
📊
BOD/COD
🌊
Hydraulics
🌡️
Temp Corr
🔵
Nitrogen
🟣
Phosphorus
⏱️
Detention
💨
Velocity
⚡
Methane
🧬 Nutrient Removal Efficiency
BNR
TN Removal
80%
Excellent
TP Removal
89%
Excellent
✓ BNR system operating at optimal efficiency
🔥 Digester Gas Production
cf/day
Total Gas
75,000
cf/day
BTU/day
30.4M
million
Power Gen
130
kW equiv
📊 BOD/COD Ratio Analysis
RATIO
BOD/COD
0.44
Biodegradable
BOD Removal
95%
COD Removal
91%
✓ Typical municipal wastewater - readily biodegradable
🔧 Operational Considerations:
• Peak vs. Average: Always check HRT at peak hourly flow
• Short-circuiting: Actual HRT often less than theoretical
• Baffles: Improve actual/theoretical HRT ratio
• Dead zones: Reduce effective volume, lower actual HRT
✓ Velocity OK for channel flow (min 1.0 ft/s recommended)
⚡ Methane Energy Potential
kWh
Methane BTU
48.8M
BTU/day
Elec. Potential
5,000
kWh/day
Daily Value
$450
/day
Annual Value: $164,250
🔬 Lab & Process Calculations
8 Calcs + Help
Standard Methods lab calculations with built-in training guides. Click ? on any calculator for regulatory standards, best practices, and troubleshooting.
📊 Total Suspended Solids (TSS)
SM 2540 D - Dried at 103-105°C
📚 Training & Reference Guide
📖 What is TSS?
Total Suspended Solids measures the concentration of particles that can be trapped by a filter. It indicates the amount of solid material in wastewater that could cause turbidity, clog pipes, or affect disinfection efficiency.
⚖️ Regulatory Standards
EPA Secondary Treatment (40 CFR 133.102):
• Monthly Average: ≤30 mg/L
• Weekly Average: ≤45 mg/L
• 85% minimum removal required Texas TPDES: Check your specific permit for limits
✓ Best Practices
• Use glass fiber filters (Whatman 934-AH or equivalent)
• Pre-rinse filters with DI water, dry at 103-105°C for 1 hour
• Use appropriate sample volume (50-100mL for effluent, 10-25mL for MLSS)
• Cool in desiccator before weighing
• Record to nearest 0.1 mg for accuracy
🔧 Troubleshooting High Effluent TSS
• Solids carryover: Check clarifier weirs for algae/biofilm, adjust RAS rate
• Rising sludge: Increase WAS, check for denitrification in clarifier
• Pin floc: Low SRT, check F/M ratio, may need polymer
• Hydraulic overload: Flow exceeding clarifier capacity
📋 Standard Methods Reference
SM 2540 D (Solids - Total Suspended) | EPA Method 160.2 | Holding Time: 7 days refrigerated
Volatile Suspended Solids represents the organic portion of TSS that burns off at 550°C. In activated sludge, MLVSS approximates the active biomass concentration responsible for treatment.
✓ Process Control Applications
• F/M Ratio: Use MLVSS for accurate food-to-microorganism calculation
• SRT Calculation: MLVSS × Volume ÷ WAS VSS × WAS Flow
• Biomass Health: MLVSS/MLSS ratio indicates organic content (70-85% typical)
• Digester Monitoring: VS destruction indicates digestion efficiency
🔧 Troubleshooting
• Low MLVSS/MLSS (<70%): Inert solids accumulation, may need to increase WAS
• High MLVSS/MLSS (>85%): Young sludge, possible underloading
• Declining ratio: Industrial discharge, check for grit/inorganics
📋 Standard Methods Reference
SM 2540 E (Fixed & Volatile Solids Ignited at 550°C) | Holding Time: 7 days refrigerated
💡 Note: VSS represents the organic (volatile) portion of TSS. MLVSS typically 70-85% of MLSS.
⏱️ Settleable Solids (Imhoff Cone)
SM 2540 F - 1 hour settling in Imhoff cone
📚 Training & Reference Guide
📖 What are Settleable Solids?
Settleable solids are particles heavy enough to settle out of suspension within 1 hour. This quick field test indicates how well primary clarifiers will perform and helps monitor industrial pretreatment compliance.
⚖️ Regulatory Standards
Industrial Pretreatment: Often limited to <0.5 mL/L for discharge to POTW NPDES Permits: Some permits specify "no visible floating solids"
✓ Test Procedure
1. Fill Imhoff cone to 1L mark with well-mixed sample
2. Let stand undisturbed 45 minutes
3. Gently rotate cone to dislodge solids from walls
4. Let settle 15 more minutes (60 min total)
5. Read mL/L directly from cone graduations
📋 Standard Methods Reference
SM 2540 F (Settleable Solids) | EPA Method 160.5 | Analyze immediately - do not store
Settleable Solids
-- mL/L
Settling Rate
-- %
💡 Typical: Raw Influent: 5-20 mL/L | Primary Effluent: 0.5-3 mL/L | Final Effluent: <0.5 mL/L
📐 Sludge Volume Index (SVI)
30-minute settleometer test
📚 Training & Reference Guide
📖 What is SVI?
Sludge Volume Index measures the settleability of activated sludge. It represents the volume (in mL) occupied by 1 gram of sludge after 30 minutes of settling. Lower SVI = better settling = better clarifier performance.
⚠️ SVI Ranges & What They Mean
<80 mL/g: Pin floc possible - may need to reduce WAS, check for toxicity 80-150 mL/g: Good settling - optimal operating range 150-200 mL/g: Light/fluffy sludge - increase WAS, check F/M >200 mL/g: Bulking sludge - microscopic exam needed, check for filaments
✓ Best Practices
• Use 1L or 2L settleometer, not Imhoff cone (different geometry)
• Record at exactly 30 minutes - timing matters
• Run at same time daily for trend analysis
• If SVI >150, also run Diluted SVI (DSVI) for accuracy
• Correlate with microscopic exam for filament ID
🔧 Troubleshooting High SVI (Bulking)
• Filamentous bulking: ID filaments, adjust F/M, add selectors
• Viscous bulking: Zoogloea - increase DO, reduce loading
• Low DO: Maintain >2.0 mg/L in aeration basin
• Nutrient deficiency: Check N and P availability
• Chlorination: RAS chlorination for severe cases (0.5-5 lb Cl₂/1000 lb MLSS)
Sludge Volume Index
-- mL/g
Enter values to calculate
Formula: SVI = (Settled Volume × 1000) / MLSS
Good <100 mL/g
Fair 100-200 mL/g
Bulking >200 mL/g
🔬 Percent Volatile Solids
Ratio of VSS to TSS (organic fraction)
📚 Training & Reference Guide
📖 What is % Volatile?
Percent volatile solids (VS or %VS) represents the organic fraction of total solids that will burn off at 550°C. This ratio helps assess sludge age, digestion efficiency, and biomass health.
✓ Typical Ranges by Sludge Type
MLVSS/MLSS: 70-85% (healthy activated sludge) Primary Sludge: 60-80% (high organic content) WAS: 70-80% (mostly biomass) Digested Sludge: 45-60% (organics destroyed) Class A Biosolids: Often <60% VS
BOD₅ measures the amount of oxygen consumed by microorganisms while decomposing organic matter over 5 days at 20°C. It's the primary measure of organic pollution strength and a key permit parameter.
• DO depletion must be ≥2.0 mg/L (adequate sample)
• Final DO must be ≥1.0 mg/L (not oxygen limited)
• Use seed for samples with low microbial population
• GGA check standard: 198 ±30.5 mg/L (use for QC)
🔧 When to Use Seeded vs Unseeded
Unseeded: Secondary effluent, unchlorinated samples with active bacteria Seeded: Industrial waste, chlorinated effluent, primary effluent, any sample lacking active bacteria
📋 Standard Methods Reference
SM 5210 B (5-Day BOD Test) | EPA Method 405.1 | Holding Time: 48 hrs, analyze within 6 hrs preferred
📋 Sample Information
🌱 Seed Correction
BOD₅ Result
318
mg/L
DO Depletion
5.3
mg/L
Dilution Factor
60
:1
✓ QC Status: PASS
DO depletion ≥2.0 mg/L ✓ | Final DO ≥1.0 mg/L ✓ | Valid test
📋 Dilution Guide (Recommended Sample Volumes)
Expected BOD
Sample Vol (mL)
Dilution
4-12 mg/L
100-300
1-3×
10-30 mg/L
50-100
3-6×
30-100 mg/L
15-50
6-20×
100-300 mg/L
5-15
20-60×
300-1000 mg/L
1-5
60-300×
>1000 mg/L
0.5-1
300-600×
Formulas: Unseeded: BOD = (D₁ - D₂) × (Bottle Vol / Sample Vol) Seeded: BOD = ((D₁ - D₂) - (B₁ - B₂) × f) × (Bottle Vol / Sample Vol) Where f = Seed in Sample / Seed in Control
📊 % Removal Efficiency
Calculate treatment efficiency for permit compliance
📚 Training & Reference Guide
📖 What is % Removal?
Percent removal measures how effectively your treatment process removes pollutants. It's calculated by comparing influent (incoming) to effluent (outgoing) concentrations. This is a PRIMARY permit compliance metric.
⚖️ EPA Secondary Treatment Standards
BOD₅ & TSS (40 CFR 133.102):
• 85% minimum removal required OR
• Monthly avg ≤30 mg/L AND Weekly avg ≤45 mg/L Note: Must meet BOTH concentration AND % removal (whichever is more stringent)
✓ Typical Removal Rates by Process
Primary Treatment: BOD 25-40%, TSS 50-70% Activated Sludge: BOD 85-95%, TSS 85-95% Extended Aeration: BOD 90-98%, TSS 90-95% Trickling Filter: BOD 65-85%, TSS 65-85% Nutrient Removal: NH₃ 90-99%, TP 80-95%
Effluent: 15 mg/L vs Limit: 30 mg/L ✓
% Removal: 92.5% vs Required: 85% ✓
📊 Typical % Removal Ranges
Excellent
BOD >90% | TSS >90%
Good
BOD 85-90% | TSS 85-90%
Poor
BOD <85% | TSS <85%
📈 Flow Totalization
Calculate daily, monthly, and annual flow totals from instantaneous readings
📚 Training & Reference Guide
📖 Why Flow Totalization Matters
Accurate flow measurement is essential for permit reporting, process control calculations (loading, detention time), chemical dosing, and capacity planning. Daily and monthly totals are required on DMR reports.
⚖️ Regulatory Requirements
NPDES Permits require:
• Daily flow totals (MG or m³)
• Monthly average flow (MGD)
• Annual average flow for capacity assessment
• Instantaneous peak flow during wet weather
✓ Flow Measurement Best Practices
• Calibrate flow meters annually (or per permit)
• Record totalizer readings at same time daily
• Check for meter drift by comparing to pump curves
• Account for bypass flows during maintenance
• Document any meter malfunctions
Oxygen transfer, blower performance, and energy optimization
💨 Oxygen Transfer Efficiency (OTE)
Calculate actual oxygen transfer rate from standard conditions
Theta Correction
-
AOTR
-
lb O₂/hr
Transfer Efficiency
-
%
🌀 Blower Performance
Brake HP
-
HP
Motor HP (w/ SF)
-
HP
Power Draw
-
kW
⚡ Energy Cost Analysis
Daily kWh
-
Monthly Cost
-
Annual Cost
-
kWh/MG
-
🧪 CHEMICAL SYSTEMS
📍 Jump to Calculator
🎯
P Removal
☣️
Chlorine
⏱️
CT Calc
💊
Polymer
⚗️
Alkalinity
🧪
Dechlor
🔶
Coagulant
⚖️
pH Adjust
🌱
Carbon
👃
Odor
🧫
Dilution
📦
Inventory
⚗️ Chemical Systems
Chemical feed optimization, dosing calculations, and disinfection
🎯 Chemical Feed Optimizer
📚 Chemical Feed Optimizer - Training Guide
📖 What is Chemical Phosphorus Removal?
Chemical P removal uses metal salts (alum, ferric chloride, PAC) to precipitate phosphorus from wastewater. The metal ion (Al³⁺ or Fe³⁺) reacts with phosphate to form insoluble precipitates that settle out in clarifiers.
⚖️ TCEQ/EPA Phosphorus Limits
Typical TPDES Limits:
• Total P: 0.5 - 2.0 mg/L (varies by watershed)
• Nutrient-impaired waters may require <0.5 mg/L TMDL watersheds: May have stricter limits - check your permit
✓ Optimal Me:P Molar Ratios
• Alum (Al:P): 1.5:1 to 2.5:1 molar (typical 2:1)
• Ferric (Fe:P): 1.5:1 to 3:1 molar (typical 2:1)
• PAC: 0.8:1 to 1.5:1 (more efficient)
Higher ratios needed for lower effluent P targets
🔧 Troubleshooting
• High effluent P: Increase dose, check pH (optimal 6.5-7.5 for alum, 4-9 for ferric)
• High sludge production: Consider biological P removal (EBPR) as primary
• Alkalinity consumption: ~0.5 mg alk/mg alum, ~0.9 mg alk/mg ferric
Optimize coagulant/flocculant dosing for phosphorus removal
Me:P Ratio
-
Dose (mg/L)
-
Feed Rate (gpd)
-
Daily Cost
-
☣️ Chlorine Disinfection
📚 Chlorine Disinfection - Training Guide
📖 What is Chlorine Disinfection?
Chlorine (Cl₂) or sodium hypochlorite (NaOCl) inactivates pathogenic microorganisms through oxidation. Forms hypochlorous acid (HOCl) in water - the primary disinfecting agent. Effectiveness depends on dose, contact time, pH, and temperature.
⚖️ TCEQ/EPA Requirements
Typical TPDES Requirements:
• Fecal Coliform: ≤200 CFU/100mL (monthly geometric mean)
• E. coli: ≤126 CFU/100mL (geometric mean)
• Residual Cl₂: Often ≤0.1 mg/L at discharge (dechlorination required) CT Requirements: Check permit for specific pathogen reduction
✓ Best Practices
• Typical doses: 5-15 mg/L for secondary effluent
• Contact time: Minimum 15-30 minutes at peak flow
• Residual target: 0.5-2.0 mg/L after contact chamber
• pH effect: Lower pH = more HOCl = better disinfection
12.5% = 1.25 lb Cl₂/gal | Degrades 0.5-1%/month | Store cool, dark | Specific Gravity: ~1.2
Cl₂ Required
-
lb/day
Solution Feed
-
gpd
CT Value
-
mg·min/L
⏱️ CT Disinfection Calculator
NEW v9.9.29
📚 CT Disinfection - Training Guide
📖 What is CT?
CT = Concentration × Time (mg/L × minutes). It quantifies disinfection effectiveness by combining disinfectant residual with contact time. Higher CT = more pathogen inactivation. Required CT values are based on log-reduction targets for specific pathogens.
⚖️ EPA CT Requirements (Surface Water Treatment)
Giardia 3-log: 104-165 mg·min/L (varies by pH/temp) Virus 4-log: 4-12 mg·min/L (chlorine very effective) Crypto: Chlorine ineffective - use UV (40 mJ/cm²) or ozone Note: Wastewater permits may have different requirements
✓ CT Calculation Tips
• Use T10: Time for 10% of water to pass (not HRT)
• T10/T ratio: 0.3-0.5 for serpentine, 0.1 for CSTR
• Measure residual: At END of contact chamber
• Peak flow: Calculate CT at maximum daily flow
Calculate CT (Concentration × Time) for disinfection compliance. CT values based on EPA Guidance Manual.
*Cryptosporidium requires UV or ozone; chlorine CT shown for reference only
CT Achieved
15.0
mg·min/L
CT Required
104
mg·min/L
CT Ratio
0.14
achieved/required
Status
❌ FAIL
Increase residual or time
📊 Log Inactivation Achieved (at current CT)
Giardia
0.4
log
Virus
3.8
log
E. coli
5.0+
log
Crypto*
<0.5
log
💡 To Achieve Compliance:
Increase chlorine residual to 1.7 mg/L OR increase contact time to 208 minutes
📋 CT Reference Table (Free Chlorine at 20°C, pH 7)
Pathogen
1-log
2-log
3-log
4-log
Giardia lamblia
35
69
104
138
Viruses
1
2
3
4
E. coli
0.03
0.06
0.09
0.12
Cryptosporidium*
N/A
N/A
N/A
N/A
*Cryptosporidium is resistant to chlorine. Use UV (40 mJ/cm²) or ozone for inactivation.
🧫 Jar Test Optimizer
Coagulant & Polymer
📚 Jar Testing - Training Guide
📖 What is Jar Testing?
Jar tests simulate full-scale coagulation/flocculation at bench scale. They determine optimal chemical doses, mixing speeds, and settling times. Results help minimize chemical costs while achieving treatment goals.
Polymers (flocculants) are long-chain organic molecules that bridge particles together, creating larger flocs for faster settling or better dewatering. Types include cationic (+), anionic (-), and nonionic based on charge.
✓ Typical Polymer Doses
Dewatering (belt press/centrifuge): 5-15 lb/dry ton Thickening: 2-8 lb/dry ton Clarification: 0.5-2 mg/L Solution strength: 0.1-0.5% (neat polymer too viscous)
🔧 Polymer Selection Tips
• Cationic: Most common for biosolids (negative sludge charge)
• Anionic: Often paired with metal coagulants
• High charge: Better for fine particles
• High MW: Better bridging, larger flocs
📋 Mixing Requirements
Wet polymer: Age 30-60 min before use | Emulsion: Dilute with low shear | Dry: Use wetting cone, age 45+ min | Over-mixing shears polymer chains
Dry Tons/Day
-
DT/day
Polymer Required
-
lb/day
Solution Feed
-
gpm
⚗️ Alkalinity Adjustment
📚 Alkalinity Adjustment - Training Guide
📖 What is Alkalinity?
Alkalinity is the buffering capacity of water - its ability to neutralize acids and resist pH changes. Measured as mg/L CaCO₃. Critical for nitrification which consumes 7.14 mg alkalinity per mg NH₃-N oxidized.
Caustic (NaOH): Fast acting, 1.25 mg alk/mg NaOH Lime (Ca(OH)₂): Cheapest, 1.35 mg alk/mg lime, handling issues Soda Ash (Na₂CO₃): Moderate cost, 0.94 mg alk/mg, easier handling Mag Hydroxide: Slow release, good for digesters
🔧 Troubleshooting
• pH swings: Increase chemical storage/feed to match load variations
• Scale buildup: Common with lime - consider caustic or soda ash
• Effluent pH high: Reduce dose or switch to CO₂ for lowering
Alk Increase Needed
-
mg/L
Chemical Required
-
lb/day
Solution Feed
-
gpd
📦 Chemical Inventory Tracker
Track & Alert
📚 Chemical Inventory Management - Training Guide
📖 Why Track Inventory?
Proper chemical inventory management prevents treatment failures from stockouts, reduces emergency orders, and helps with budgeting. Track daily usage to predict reorder timing and optimize delivery schedules.
✓ Best Practices
Reorder point: Set at 2-3 weeks supply minimum Safety stock: Account for delivery delays (7-14 days) FIFO: Use oldest stock first (especially hypochlorite) Documentation: Log all deliveries and usage
🔧 Storage Tips
• Hypochlorite: Store cool/dark, degrades 0.5-1%/month
• Acids/Bases: Never store together, check secondary containment
• Polymers: Keep dry, protect from UV, check expiration
• All chemicals: Maintain current SDS, proper labeling
Track chemical inventory levels, usage rates, and receive low-stock alerts.
Chemical
Current (gal)
Daily Use
Days Left
Reorder Pt
Status
Actions
➕ Add Chemical
⚠️ Low Stock
0
📦 Total Items
0
💰 Inventory Value
$0
📅 Avg Days Supply
0
⚠️ Inventory Alerts:
🔧 MAINTENANCE
Equipment tracking, PM schedules, runtime hours, and calibration management
📍 Jump to Section
🔧
PM Tracker
📐
Calibration
📦
Spare Parts
📝
Work Orders
🔧 Equipment PM Tracker
NEW v9.9.16
Track equipment runtime hours, maintenance schedules, and costs. Get alerts before PM is due.
⚠️ Overdue
0
📅 Due Soon (7d)
0
✓ Up to Date
0
💰 YTD Cost
$0
Equipment
Category
Runtime (hrs)
Last PM
Interval
Next Due
Status
Actions
➕ Add Equipment
⏱️ Log Equipment Runtime
✅ Record PM Completion
📜 Recent Maintenance History
📋
No maintenance history yet
🔬 Calibration Tracking
Instrument
Location
Last Cal
Due
Status
DO Probe #1
Aeration Basin
2024-11-20
2024-12-20
OK
pH Analyzer
Effluent
2024-11-25
2024-12-25
OK
Flow Meter
Influent
2024-06-01
2024-12-01
Overdue
Turbidity
Effluent
2024-11-01
2024-12-01
Due Soon
🛠️ Work Order Log
WO-2024-142In Progress
Blower #2 bearing replacement
Assigned: John D. | Due: 12/10/2024
WO-2024-143Urgent
UV lamp replacement - Bank A
Assigned: Mike S. | Due: 12/08/2024
📏 Instrument Calibration Tracker
NEW v9.9.27
Track instrument calibrations, due dates, and compliance. Get alerts before calibrations expire.
⚠️ Overdue
1
📅 Due 7 Days
3
✓ Current
12
📊 Compliance
94%
Instrument
Location
Last Cal
Next Due
Freq
Status
Action
📡 ONLINE PROCESS ANALYZERS
DO Probe #1 Hach LDO2
Aeration Basin 1
12/01/24
12/15/24
14 days
OVERDUE
DO Probe #2 Hach LDO2
Aeration Basin 2
12/08/24
12/22/24
14 days
OVERDUE
pH Probe - Influent Hach pHD sc
Influent Structure
12/20/24
12/27/24
7 days
DUE TODAY
pH Probe - Effluent Hach pHD sc
Effluent
12/22/24
12/29/24
7 days
DUE SOON
ORP Probe Hach DRD8E
Anoxic Zone
12/15/24
01/15/25
30 days
CURRENT
TSS Analyzer - MLSS Hach Solitax sc
Aeration Basin
12/10/24
01/10/25
30 days
CURRENT
TSS Analyzer - RAS Hach Solitax sc
RAS Line
12/10/24
01/10/25
30 days
CURRENT
Turbidity - Effluent Hach TU5300 sc
Effluent
12/15/24
01/15/25
30 days
CURRENT
Chlorine Analyzer Hach CL17sc
Disinfection
12/10/24
01/10/25
30 days
CURRENT
Ammonia Analyzer Hach Amtax sc
Effluent
12/01/24
01/01/25
30 days
CURRENT
📊 FLOW METERS
Influent Flow Meter Endress+Hauser Promag
Influent
06/15/24
06/15/25
Annual
CURRENT
Effluent Flow Meter Endress+Hauser Promag
Effluent
06/15/24
06/15/25
Annual
CURRENT
RAS Flow Meter Endress+Hauser Promag
RAS Pump Station
06/15/24
06/15/25
Annual
CURRENT
WAS Flow Meter Endress+Hauser Promag
WAS Pump Station
06/15/24
06/15/25
Annual
CURRENT
📏 LEVEL INSTRUMENTS
Wet Well Level Siemens Ultrasonic
Lift Station
09/01/24
03/01/25
6 months
CURRENT
Clarifier Blanket Hach Sludge Blanket
Secondary Clarifier
11/01/24
02/01/25
Quarterly
CURRENT
🔬 BENCHTOP LAB EQUIPMENT
Benchtop pH Meter Hach HQ440d
Laboratory
12/26/24
12/27/24
Daily
DUE TODAY
Benchtop DO Meter YSI ProODO
Laboratory
12/20/24
12/27/24
Weekly
DUE TODAY
Benchtop Conductivity Hach HQ440d
Laboratory
12/01/24
01/01/25
Monthly
CURRENT
Turbidimeter Hach 2100Q
Laboratory
12/15/24
01/15/25
Monthly
CURRENT
Spectrophotometer Hach DR3900
Laboratory
12/01/24
01/01/25
Monthly
CURRENT
Analytical Balance Mettler Toledo
Laboratory
06/01/24
06/01/25
Annual
CURRENT
BOD Incubator Thermo NIST Traceable
Laboratory
12/01/24
01/01/25
Monthly
CURRENT
Oven Thermometer NIST Traceable
Laboratory
12/01/24
01/01/25
Monthly
CURRENT
Pipettes (Set of 4) Eppendorf
Laboratory
06/01/24
06/01/25
Annual
CURRENT
⚠️ SAFETY / CONFINED SPACE
4-Gas Monitor #1 MSA Altair 4XR
Operations
12/20/24
12/30/24
Monthly
DUE SOON
4-Gas Monitor #2 MSA Altair 4XR
Operations
12/20/24
12/30/24
Monthly
DUE SOON
H₂S Area Monitor RKI GD-70D
Headworks
09/01/24
03/01/25
6 months
CURRENT
Chlorine Area Monitor Honeywell Manning
Disinfection Bldg
09/01/24
03/01/25
6 months
CURRENT
📋 Recent Calibration Log
pH Probe #1 calibrated - 2-point (4.0, 7.0)12/20/24 08:15 - J. Smith
DO Probe #1 calibrated - Zero/Span12/01/24 07:30 - M. Johnson
Turbidity Meter verified - 20 NTU standard12/15/24 14:00 - J. Smith
All inputs, outputs, formulas, with professional formatting
📋 Report Configuration
🏭 Plant Information
📅 Daily Values
🏭 Visit Details
📝 Notes & Comments
👁️ Report Preview
📤 Quick Export
🧮 ALL CALCULATORS
Process Loading • Chemical Dosing • Hydraulics • Clarifiers
📍 Jump to Calculator (50+ Available)
⚙️ PROCESS LOADING
🧫
OLR
⚖️
F/M
⏱️
SRT
🕐
HRT
🧪
SVI
🚿
WAS
🔄
RAS
☣️ CHEMICAL DOSING
☣️
Chlorine
💊
Polymer
🔶
Coagulant
⚗️
pH
🌱
Carbon
👃
Odor
🧫
Dilution
🌊 HYDRAULICS & FLOW
⛽
Pumping
🌊
SOR
🔄
WOR
🔧
Pipes
〰️
Manning
🌊
Weir
🔬 ADVANCED
⚖️
Mass Bal
💨
OTE
⚠️
Risk
🔬
Nutrients
🧮 Process Calculators
🧫 Organic Loading Rate (OLR)
BOD Loading
-
lb/day
Organic Loading Rate
-
lb BOD/1000 cf/day
⚖️ F/M Ratio (Food to Microorganism)
MLVSS Mass
-
lb
F/M Ratio
-
lb BOD/lb MLVSS/day
Status
-
⏱️ Sludge Retention Time (SRT)
System Solids
-
lb
Solids Wasted
-
lb/day
SRT (Sludge Age)
-
days
Status
-
🕐 Hydraulic Detention Time (HRT)
Detention Time
-
hours
Status
-
📉 BOD Removal Efficiency
Removal Efficiency: - %
BOD Removed
-
mg/L
Removal Efficiency
-
%
Status
-
🧪 Sludge Volume Index (SVI)
SVI
-
mL/g
Settling Quality
-
🚿 Waste Activated Sludge (WAS)
Required WAS Flow
-
GPD
Solids Wasted
-
lb/day
🔄 Return Activated Sludge (RAS)
RAS Ratio
-
%
RAS Flow
-
MGD
☣️ Chlorine Dosing
Chlorine Required
-
lb/day
Solution (12.5%)
-
gal/day
💊 Polymer Dosing
📚 Polymer Dosing - Training Guide
📖 Polymer Dosing Basics
Polymers are dosed based on dry solids loading, typically measured in pounds polymer per dry ton of solids (lb/DT). Optimal dosing depends on sludge characteristics, solids concentration, and equipment type.
• Jar tests: Perform to determine optimal dose
• Conditioning: Ensure proper mixing/contact time
• Overdosing signs: Slimy cake, poor release, high filtrate TSS
• Underdosing: Poor capture, thin cake, high filtrate TSS
Dry Solids
-
lb/hr
Polymer Required
-
lb/hr
🧪 Dechlorination (Sulfite)
📚 Dechlorination - Training Guide
📖 What is Dechlorination?
Dechlorination removes residual chlorine before discharge to protect aquatic life. Sulfur compounds (sodium bisulfite, sodium sulfite, or SO₂ gas) are most common. Reaction is instantaneous - proper mixing is critical.
⚖️ TCEQ/EPA Requirements
Typical TPDES Limits:
• Total Residual Chlorine (TRC): Often ≤0.1 mg/L or non-detect
• Some permits: 0.05 mg/L daily max
• Acute toxicity: Chlorine toxic to fish at >0.01 mg/L
💡 Dechlorination Info: Sodium bisulfite (SBS) or sulfur dioxide removes chlorine residual before discharge. Typical ratio: 1.0-1.5 mg SBS per 1.0 mg Cl₂. Adjust SG and Strength from your SDS.
SBS Required (100%)
-
lb/day
Solution Feed Rate
-
gal/day
Daily Cost
-
$/day
🔶 Coagulant Dosing (Ferric/Alum)
📚 Coagulant Dosing - Training Guide
📖 What are Coagulants?
Coagulants are metal salts that destabilize colloidal particles, allowing them to aggregate and settle. Primary uses include TSS/turbidity reduction, phosphorus removal, and enhanced primary treatment. Common types: ferric chloride, alum, PAC.
✓ Typical Dose Ranges
Ferric Chloride: 20-60 mg/L (as FeCl₃) Alum: 15-50 mg/L (as Al₂(SO₄)₃·14H₂O) PAC: 10-30 mg/L (more efficient) Jar test: Always optimize dose via jar testing
🔧 Important Considerations
• pH effect: Alum optimal 6.0-7.5, Ferric works 4-9 range
• Alkalinity: Consumed by coagulation - may need supplementation
• Sludge increase: 30-50% more primary sludge expected
• Corrosivity: Both are corrosive - proper materials required
💡 Coagulation: Ferric chloride and alum are used for phosphorus removal and TSS reduction. Adjust SG and Strength from your SDS.
Chemical Required
-
lb/day
Solution Feed Rate
-
gal/day
Feed Pump Setting
-
gal/hr
Daily Cost
-
$/day
⚖️ pH Adjustment
📚 pH Adjustment - Training Guide
📖 Why pH Control?
pH affects biological treatment efficiency, chemical reactions, corrosion, and discharge compliance. Nitrification optimal at pH 7.2-8.0, fails below 6.5. Most permits require effluent pH 6.0-9.0.
⚖️ TCEQ/EPA Standards
Typical TPDES Limits: pH 6.0 - 9.0 standard units Pretreatment: Industrial dischargers often 5.0 - 11.0 Stream standards: Vary by classification, typically 6.5-9.0
✓ Chemical Selection
To raise pH: Caustic (fast), Lime (cheap), Soda Ash (moderate), Mag Hydroxide (slow) To lower pH: Sulfuric Acid (fast), CO₂ (safe, won't over-acidify), HCl (avoid chlorides)
🔧 Control Tips
• High buffering: Requires more chemical per pH unit change
• CO₂ advantage: Cannot lower pH below ~6.3 (self-limiting)
• Mixing: Ensure rapid, complete mixing at injection point
• Analyzer: Calibrate pH probes frequently (weekly minimum)
💡 pH Control: Caustic (NaOH) raises pH. Sulfuric acid (H₂SO₄) or CO₂ lowers pH. Adjust SG and Strength from your SDS.
Estimated Chemical
-
lb/day
Solution Feed
-
gal/day
Daily Cost
-
$/day
Notes
-
🌱 Carbon Source Dosing
📚 Carbon Source Dosing - Training Guide
📖 Why External Carbon?
Denitrifying bacteria need an organic carbon source to convert nitrate to nitrogen gas. When wastewater BOD is insufficient (BOD:TKN <4:1), external carbon is added. Common in tertiary denitrification and low-strength wastewaters.
✓ Carbon Source Options
Methanol: 2.5-3.0 lb/lb N removed (cheapest, flammable) Glycerin: 4-5 lb/lb N (byproduct, variable quality) MicroC/Glycerol: 3-4 lb/lb N (proprietary, consistent) Acetic Acid: 3.5-4 lb/lb N (fast acting, expensive)
🔧 Process Control
• Underdosing: Incomplete denitrification, high effluent NO₃
• Overdosing: Increased effluent BOD, higher sludge production
• Feed point: Add to anoxic zone with good mixing
• ORP control: Target -50 to -150 mV in anoxic zone
💡 Denitrification Carbon: External carbon needed when BOD:N ratio is too low. Adjust SG and C:N ratio from your SDS.
N Load Removed
-
lb N/day
Carbon Required
-
lb/day
Feed Rate
-
gal/day
Daily Cost
-
$/day
👃 Odor Control Dosing
📚 Odor Control - Training Guide
📖 What Causes Odors?
Hydrogen sulfide (H₂S) is the primary odor compound in wastewater - produced by anaerobic bacteria reducing sulfate. Detectable at 0.5 ppb, dangerous at >100 ppm. Other odors: mercaptans, ammonia, organic acids.
Iron Salts: Precipitate sulfide (Fe:S ratio 2-4:1) Calcium Nitrate: Promotes biological sulfide oxidation Peroxide: Oxidizes H₂S directly (expensive) Aeration: Prevents septicity in force mains
🔧 Application Points
• Collection system: Upstream of problem areas (lift stations)
• Headworks: Immediate odor control at plant
• Force mains: Iron or nitrate at pump station
• Contact time: Allow adequate time for reaction
💡 H₂S Control: Ferrous/ferric salts, nitrate, or oxidizers control hydrogen sulfide. Adjust SG and Strength from your SDS.
Chemical Required
-
lb/day
Feed Rate
-
gal/day
Daily Cost
-
$/day
🧫 Chemical Dilution Calculator
📚 Chemical Dilution - Training Guide
📖 The Dilution Formula
C₁V₁ = C₂V₂ (Concentration₁ × Volume₁ = Concentration₂ × Volume₂). This formula calculates how much concentrated stock solution to mix with water to achieve a target concentration.
✓ Common Dilution Examples
Polymer: 100% neat → 0.5% solution for feeding Hypochlorite: 12.5% → 1% for cleaning Acid/Base: Concentrated → dilute for safe handling Lab reagents: Stock solutions for testing
⚠️ Safety Rules
ALWAYS: Add acid to water (not water to acid!) Exothermic: Dilution releases heat - add slowly PPE: Eye protection, gloves, apron for concentrates Ventilation: Required for volatile chemicals
📋 Tips
Use graduated cylinders for accuracy | Mix in appropriate container | Label diluted solutions with concentration and date | Check SDS for compatibility
💡 Dilution Formula: C₁V₁ = C₂V₂ (Concentration × Volume of stock = Concentration × Volume of diluted)
Stock Solution Needed
-
gallons
Water to Add
-
gallons
Dilution Ratio
-
: 1
⛽ Pumping & Hydraulics
Water Horsepower
-
HP
Brake Horsepower
-
HP
Motor Horsepower
-
HP
Power Draw
-
kW
⚗️ Alkalinity Requirements
Alkalinity Consumed
-
mg/L as CaCO3
Daily Alk Required
-
lb/day
🌊 Surface Overflow Rate (SOR)
Surface Overflow Rate
-
gpd/sq ft
-
Status
-
🔄 Weir Overflow Rate (WOR)
Weir Overflow Rate
-
gpd/ft
-
Status
-
📊 Solids Loading Rate (SLR)
Solids Loading Rate
-
lb/sq ft/day
-
Status
-
⏱️ Mean Cell Residence Time (MCRT)
System Solids
-
lb
Solids Wasted
-
lb/day
MCRT
-
days
Status
-
💨 Oxygen Uptake Rate (OUR)
OUR
-
mg/L/hr
SOUR
-
mg O2/g MLVSS/hr
Status
-
📅 Sludge Age Calculator (Multiple Methods)
5 Methods
Calculate SRT/MCRT using different methods. Compare results to verify accuracy.
Calculate optimal RAS rate to maintain target MLSS and prevent settling issues.
📊 RAS Ratio Method
Calculate RAS based on desired RAS/Q ratio. Typical range: 25-100% of influent flow.
🎯 Target MLSS Method
Calculate RAS rate needed to achieve target MLSS based on mass balance.
📏 Sludge Blanket Control Method
Adjust RAS to maintain target sludge blanket depth in clarifier.
📚 RAS Operating Guidelines
Parameter
Typical Range
Notes
RAS Ratio (RAS/Q)
25-100%
Higher during high flows
RAS Concentration
6,000-12,000 mg/L
Should be 2-4x MLSS
Sludge Blanket
1-3 ft
Keep below weir level
RAS TSS/MLSS Ratio
2.0-4.0
Lower indicates poor settling
Clarifier SLR
20-35 lb/sf/day
Peak: 50 lb/sf/day max
⚠️ RAS Troubleshooting:
Rising blanket: Increase RAS rate or reduce WAS
Low RAS concentration: Check for denitrification, reduce RAS rate
RAS > 100%: Check for hydraulic issues, high SVI
Thin blanket: May reduce RAS, but monitor effluent TSS
🏊 Clarifier Loading Calculator
SLR, SOR, WLR
Calculate solids loading rate (SLR), surface overflow rate (SOR), and weir loading rate (WLR) for secondary clarifiers.
🏗️ Clarifier Configuration
Perimeter = πD
💧 Flow & Solids Data
📚 Secondary Clarifier Design Criteria
Parameter
Average
Peak
Units
Surface Overflow Rate (SOR)
400-800
1,000-1,200
gpd/sf
Solids Loading Rate (SLR)
20-30
50
lb/sf/day
Weir Loading Rate (WLR)
10,000-20,000
30,000
gpd/lf
Hydraulic Detention Time
1.5-2.5
-
hours
Side Water Depth
12-15
-
ft
✓ Good Settling
SVI < 120, SLR < 25
⚠️ Fair Settling
SVI 120-180, SLR 25-35
✗ Poor Settling
SVI > 180, SLR > 35
🧪 Sludge Judge / Settleometer
30-Min Settling Test
Record settling test readings and calculate SVI, settling rate, and sludge characteristics.
⚙️ Test Setup
📏 Settling Readings (mL)
Enter settled sludge volume at each time interval. Start with initial volume (usually 1000 or 2000 mL).
📈 Settling Curve
📚 SVI Interpretation Guide
SVI (mL/g)
Settling Quality
Sludge Condition
Action
< 80
Excellent
Old sludge, pin floc possible
May reduce WAS, check effluent TSS
80-120
Good
Normal, healthy sludge
Maintain current operations
120-150
Fair
Light bulking beginning
Monitor closely, check DO/nutrients
150-200
Poor
Bulking sludge
Identify filaments, adjust process
> 200
Very Poor
Severe bulking
Immediate action required
SVI Formula:
SVI = (Settled Vol mL × 1000) / (Cylinder mL × MLSS mg/L)
Typical Targets:
Conventional: 80-150 Extended Air: 100-200 MBR: N/A (no settling)
🔄 Gravity Thickener Loading
Surface Area
-
sf
Hydraulic Loading
-
gpd/sf
Solids Loading
-
lb/sf/day
Status
-
🗜️ Dewatering Performance
⚖️ Plant Mass Balance
For comprehensive mass balance calculations including BOD, TSS, TKN, and TP through the entire treatment train, see the Mass Balance Calculator in the 📐 Hydraulics tab.
🔥 Biogas & Digester Calculator
Comprehensive
Complete anaerobic digester analysis: loading, gas production, heating, and energy recovery.
🏗️ Digester Configuration
📥 Sludge Feed
⚡ Performance Parameters
💰 Energy & Economics
📚 Digester Design Guidelines
Parameter
Standard Rate
High Rate
Two-Stage
SRT (days)
30-60
10-20
10-15 (1st)
VS Loading (lb/cf/d)
0.03-0.10
0.15-0.40
0.25-0.50
VS Destruction (%)
35-50
50-65
55-65
Temperature (°F)
Ambient
95 (meso)
95-131
Mixing
None
Continuous
Both stages
Gas Composition:
CH₄: 60-70%
CO₂: 30-40%
H₂S: 0.1-0.5%
Trace: N₂, H₂, etc.
Visual calculation tools for process, chemical & solids parameters
📖How to Use Nomographs - Reference Guide
▼
📐 What are Nomographs?
Nomographs are visual calculation tools that allow operators to quickly determine process parameters by inputting known values. Originally paper-based graphical calculators, these digital versions provide instant results with visual feedback scales showing where your values fall within typical operating ranges.
🎯 How to Use
1
Enter Your Values
Type your plant's actual values into the input fields. Calculations update automatically as you type.
2
Read the Results
View calculated values in the result boxes. Large numbers show your primary result.
3
Check the Visual Scale
The sliding marker shows where your value falls. Green = good, Yellow = caution, Red = action needed.
4
Review Status Messages
Read interpretation text for specific guidance on what your results mean and actions to consider.
🎨 Visual Scale Legend
Green = Optimal range
Yellow = Caution/Monitor
Red = Outside limits
White marker = Your value
📊 Quick Reference - Typical Ranges
⚙️ Process/Biological
Parameter
Low
Optimal
High
Notes
SRT (days)
<5
5-15
>25
Extended aeration: 15-30
F/M Ratio
<0.05
0.1-0.4
>0.5
Extended aeration: 0.05-0.15
Overflow Rate (gpd/sf)
<400
400-800
>1200
Peak: <1,200
Solids Loading (lbs/d/sf)
<15
20-30
>50
Secondary clarifier
SVI (mL/g)
<50
80-150
>200
>150 = bulking possible
⚗️ Chemical/Disinfection
Parameter
Minimum
Target
Notes
CT Value (mg·min/L)
25
>37
25=2-log Giardia, 37=3-log, adjust for pH/temp
Cl₂ Residual (mg/L)
0.5
1-2
Check permit for max limit
Contact Time (min)
15
30+
At peak flow conditions
🚛 Solids/Digestion
Parameter
Typical Range
Notes
Gas Production (cf/lb VS)
12-18
VS destroyed basis
VS Destruction (%)
50-60%
Mesophilic anaerobic
Methane Content (%)
60-70%
Balance mostly CO₂
Polymer Dose (lbs/DT)
15-25
Varies by sludge type
Belt Press Cake (%)
18-25%
Centrifuge: 22-30%
GBT Loading (lbs/hr/sf)
40-100
DAF: 20-40, Gravity: 5-15/day
💡 Tips for Best Results
✓Use lab-verified values for most accurate results
✓Track trends over time - single readings can be misleading
✓Consider seasonal variations when interpreting results
✓Use multiple nomographs together for complete process picture
✓Typical ranges may vary - know your plant's optimal conditions
Choose a problem to diagnose. Each wizard will guide you through step-by-step questions to identify the root cause and recommend solutions.
🔴
High Effluent TSS
TSS exceeding permit limits? Diagnose clarifier, biological, and hydraulic causes.
8 Decision Points →
🟠
Filamentous Bulking
SVI > 150? Poor settling? Identify filament type and targeted solutions.
10 Decision Points →
🔵
High Effluent Ammonia
NH₃-N above limits? Check nitrification, DO, alkalinity, and toxicity.
9 Decision Points →
🟢
Low DO Problems
Can't maintain DO setpoint? Diagnose aeration, loading, and equipment issues.
8 Decision Points →
🟤
Foam/Scum Issues
Excessive foam on basins or clarifiers? Identify foam type and control strategies.
6 Decision Points →
👃
Odor Control
H₂S or septic odors? Locate sources and implement control measures.
7 Decision Points →
🟣
Nutrient Removal
High phosphorus or nitrogen? Optimize Bio-P, chemical, and denitrification.
10 Decision Points →
⚡
Blower/Aeration
Equipment issues, high amps, surge? Diagnose blower and air distribution problems.
9 Decision Points →
🔧
Clarifier Mechanical
High torque, scum issues, weir problems? Troubleshoot clarifier equipment.
8 Decision Points →
💧
RAS/WAS Optimization
Sludge return issues? Optimize RAS rate, WAS control, and maintain MLSS.
8 Decision Points →
🧭 Wizard Active
Step 1 of 812%
Question will appear here...
📍 Diagnosis Path:
Start → ...
✅ Diagnosis Complete
📜 Recent Diagnoses
No diagnoses completed yet. Run a wizard to see your history here.
🏭 MULTI-PLANT
🏭 Multi-Plant Fleet Management
🏭 Fleet Operations Dashboard
Centralized monitoring and management for multiple treatment facilities
Total Plants
4
Total Capacity
18.5 MGD
Online
3
Avg Efficiency
93.1%
Total Flow
15.1 MGD
Avg Load
82%
📊 Fleet Performance Comparison
North Regional WWTPONLINE
📍 Houston, TX
Capacity: 5.0 MGD
Flow: 4.2 MGD
Efficiency: 94.5%
Load: 84%
South Municipal PlantONLINE
📍 Pearland, TX
Capacity: 3.5 MGD
Flow: 2.8 MGD
Efficiency: 92.1%
Load: 80%
East Industrial WWTPMAINTENANCE
📍 Pasadena, TX
Capacity: 8.0 MGD
Flow: 6.5 MGD
Efficiency: 89.7%
Load: 81%
West Community PlantONLINE
📍 Katy, TX
Capacity: 2.0 MGD
Flow: 1.6 MGD
Efficiency: 96.2%
Load: 80%
⏰ Detention Time (General)
Detention Time
-
minutes
Detention Time
-
hours
👥 Population Equivalent
PE (BOD basis)
-
people
PE (Flow basis)
-
people
GPD per capita
-
gpd/person
📅 Sludge Age (Simple)
Sludge Age
-
days
Status
-
📉 Percent Removal (Universal)
Amount Removed
-
units
Percent Removal
-
%
🔄 Flow Unit Converter
MGD
-
GPM
-
GPD
-
CFS
-
m³/day
-
L/s
-
🔊 Blower Noise Estimation
Est. Sound Level
-
dB(A)
Status
-
🌍 Carbon Footprint Estimator
Energy CO2
-
lb CO2/day
Chemical CO2
-
lb CO2/day
Biogas Offset
-
lb CO2/day
Net Carbon
-
lb CO2/day
💰 Treatment Cost Analysis
Total Daily Cost
-
$/day
Cost per MG
-
$/MG
Cost per 1000 gal
-
$/1000 gal
Monthly Cost
-
$/month
Annual Cost
-
$/year
📈 Fleet Analytics Summary
93.1%
Fleet Avg Efficiency
↑ 2.3% vs last month
82%
Avg Capacity Utilization
Optimal Range
$45.2K
Monthly Operating Cost
↓ 5% vs budget
99.2%
Compliance Rate
All permits current
💡 Tips: Click on a plant card to select it, then use Edit/Delete buttons. Use Compare to analyze multiple plants side-by-side. Export data to CSV for reporting.
🔀 Interactive Troubleshooting Wizard
9 PROBLEM CATEGORIES
Step-by-step diagnostic decision trees with visual path tracking
⚠️ Select Problem Category
🔀 Decision Path
Start
Full path with answers:
🌫️
Troubleshooting: High Effluent TSS
Step 1 of 5
❓ Diagnostic Question
Is the effluent turbid throughout the day, or only during peak flows?
🎯
Root Cause Identified
Diagnosis will appear here
Diagnosis Confidence0%
🚨 Immediate Actions (1-24 hrs)
Loading actions...
⚡ Short-term Fixes (1-7 days)
Loading actions...
🎯 Long-term Solutions
Loading actions...
🧮 Related Calculators
📊 Reference Values & Targets
🔀 Decision Path Taken
📋 Recent Troubleshooting History
No troubleshooting history yet. Complete a diagnosis to save it here.
🔮 Process Simulations
20 SCENARIOS
"What happens if..." - Predict process changes before you make them
⚡ Quick Scenarios
🛠️ Custom Simulation Builder
📊 CURRENT CONDITIONS
🔄 PROPOSED CHANGES
Simulation Results
⚠️
HIGH RISK
Multiple process parameters will be affected
⏱️ TIME TO NOTICEABLE IMPACT
2-6 hours
🔄 RECOVERY TIME
1-3 days
📊 Parameter Impact Analysis
🔗 Cascading Effects Timeline
📋 Compliance Risk
⚙️ Operational Risk
🦠 Biology Risk
✅ Recommended Actions
👁️ Key Monitoring Points
🧮 Related Calculators
📜 Recent Simulations
No simulations run yet. Select a scenario above to begin.
📜 Texas TCEQ Certification Prep
CLASS D-C-B-A
Practice tests for Texas Wastewater Operator Certification Exams
🌱ENTRY
Class D
Entry Level Operator
• Basic plant operations
• Safety fundamentals
• Simple calculations
No tests taken yet
📘INTERMEDIATE
Class C
Intermediate Operator
• Process control basics
• Lab procedures
• Intermediate math
No tests taken yet
📙ADVANCED
Class B
Advanced Operator
• Supervisor responsibilities
• Advanced process control
• Complex calculations
No tests taken yet
👑EXPERT
Class A
Chief Operator
• Full plant management
• Regulatory compliance
• All calculations
No tests taken yet
📚 Study by Topic
Class D Practice ExamSTUDY MODE
Question
1/50
Score
0%
Time Left
60:00
📚 Topic: General OperationsMEDIUM
Loading question...
💡 Explanation
🗂️ Question Navigator
⬜ Unanswered🟩 Correct🟥 Incorrect🟨 Skipped
🎉
Congratulations!
You passed the practice exam
85%
Final Score
43
Correct
7
Incorrect
45:32
Time
📊 Performance by Topic
📜 Test History
No tests taken yet. Start a practice exam to track your progress!
📁
Document Center
SOPs, Permits, P&IDs, and Plant Documentation
0
SOPs
0
Permits
0
P&IDs
📋 Standard Operating Procedures
📋
No SOPs added yet
Click "+ Add SOP" to create your first procedure
📜 Permits & Regulatory Documents
📜
No permits added yet
Click "+ Add Permit" to store permit documents
🔧 P&IDs & Plant Drawings
Store and view Process & Instrumentation Diagrams, plant layouts, and equipment drawings.
🔧
No P&IDs added yet
Click "+ Add Drawing" to upload plant drawings
📂 Other Documents
Miscellaneous plant documents, manuals, reports, and reference materials.
📂
No documents added yet
Click "+ Add Document" to store reference materials
🎓
Training & Safety Center
OSHA-compliant safety procedures + 70+ curated training videos
Lockout/Tagout procedures prevent the unexpected startup or release of stored energy during maintenance and servicing activities. At WWTPs, this includes pumps, blowers, mixers, clarifier drives, conveyors, and all electrical equipment.
📋 Standard LOTO Procedure - 8 Steps
1
Preparation
Identify all energy sources. Review equipment-specific LOTO procedures.
2
Notification
Notify all affected employees that equipment will be locked out.
3
Equipment Shutdown
Shut down equipment using normal operating controls.
4
Isolation
Isolate equipment from ALL energy sources.
5
Apply LOTO Devices
Apply your personal lock and tag to each energy isolation point.
6
Release Stored Energy
Bleed air/hydraulic lines, discharge capacitors, release spring tension.
7
Verification
Verify isolation by attempting to start equipment. Confirm zero energy state.
8
Perform Work
Equipment is now safe. Keep LOTO in place until ALL work is complete.
🏭 Common WWTP Equipment LOTO Points
💧 Pumps
• Electrical disconnect (MCC or local) • Suction/discharge valves • VFD isolation if equipped
🌀 Blowers/Aerators
• Main electrical disconnect • Inlet/outlet dampers • Bleed air pressure
⚙️ Mixers/Flocculators
• Motor disconnect • VFD isolation • Impeller blocking
🔄 Clarifier Drives
• Main drive motor disconnect • Rake mechanism blocking • Skimmer drive isolation
🚧 Confined Space Entry Procedures
OSHA 29 CFR 1910.146
📖 What is a Confined Space?
A space that meets ALL THREE criteria: (1) Large enough to enter, (2) Limited entry/exit, (3) NOT designed for continuous occupancy.
Colorless gas - "rotten egg" odor at low levels OLFACTORY FATIGUE above 100 ppm - you can't smell it!
📊 H₂S Exposure Levels
Level
Effects
Action
0.01-0.3 ppm
Odor threshold
Be aware
10 ppm
OSHA PEL, eye irritation
Exit, ventilate
50-100 ppm
Severe damage, loss of smell
Emergency! SCBA required
100 ppm
IDLH - Can't smell it!
Life-threatening
700+ ppm
Immediate death
Single breath fatal
🏭 H₂S Sources at WWTPs
🕳️ Collection
Manholes, wet wells, lift stations
📥 Headworks
Screening, grit removal areas
🔄 Primary
Clarifier scum troughs, sludge wells
🧪 Sludge
Digesters, belt press, truck loading
🦺 Personal Protective Equipment (PPE)
📋 PPE by Task
Task
👷
👓
👂
😷
🧤
👢
General Plant
✅
✅
-
-
-
✅
Blower Room
✅
✅
✅
-
-
✅
Chemical Feed
✅
Goggles
-
APR
Chem
✅
Chlorine Room
✅
Full
-
SCBA
Chem
✅
Confined Space
✅
✅
-
SCBA
✅
✅
👷
Head
Type I/II, Class E (electrical rated)
👓
Eye/Face
ANSI Z87.1, side shields
🧤
Hands
Match glove to hazard type
😷
Respiratory
Fit testing required
🚨 Emergency Response
📞 EMERGENCY CONTACTS
Emergency
911
Poison Control
1-800-222-1222
CHEMTREC
1-800-424-9300
🔥
FIRE
Activate fire alarm
Call 911
Evacuate via nearest exit
Meet at assembly point
Do NOT re-enter
☠️
CHEMICAL SPILL
Evacuate upwind
Alert others
Identify chemical (SDS)
Don appropriate PPE
Contain if trained
🏥
MEDICAL
Ensure scene is safe
Call 911
Provide first aid if trained
Get AED if cardiac
Stay with victim
⚠️ CONFINED SPACE RESCUE
NEVER enter without SCBA and retrieval equipment! Most fatalities are would-be rescuers. Call for help, use retrieval system from outside, wait for trained rescue team.
⚗️ Hazard Communication (HazCom)
OSHA 29 CFR 1910.1200
🏷️ GHS Hazard Pictograms
💥
Explosive
🔥
Flammable
🧪
Corrosive
☠️
Toxic
⚠️
Irritant
🫁
Health Hazard
📄 SDS - 16 Required Sections
1. Identification
9. Physical/chemical properties
2. Hazard(s) identification
10. Stability and reactivity
3. Composition/ingredients
11. Toxicological info
4. First-aid measures
12. Ecological info
5. Fire-fighting measures
13. Disposal considerations
6. Accidental release
14. Transport info
7. Handling and storage
15. Regulatory info
8. Exposure controls/PPE
16. Other information
⚡ Electrical Safety
NFPA 70E
⚡⚠️⚡
ARC FLASH HAZARD
Up to 35,000°F - Always verify de-energized state and wear appropriate PPE
📋 Electrical Safety Rules
1.Only qualified persons work on electrical
2.Assume all circuits energized until proven otherwise